quiz_1_solutions - Chemistry 112 Spring 2008 Quiz 1 Name:...

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Unformatted text preview: Chemistry 112 Spring 2008 Quiz 1 Name: You must Show all of your work and use significant figures. 1. 50.0 g of C82 is reacted with 70.0 g of 02 according to (352(8) + 02(8) molar masses: 76.143 31.998 \ ’33 a) Balance the equation (2 pts) b) Which is the limiting reactant? (2 pts) WM (L?) t\ out 00"; k ‘ ma . i Q, ‘ Wm" ‘ SEND (is: _ 0,0441% t"? 0/6224“ l mac/:5; 2?“ 49 $0433 68 “’3” L r t 1 E .. g (5:1 2w w 054* ‘V"M€"€'Qé«z\ (am 4 . 0 Rm 2, Ewith ) 4:» was age ii I; 0) Upon completion of the reaction What mass of the excess reagent remains unreacted? (2 n D “A”: E) :4", axon“ u...“ M” d) What is the theoretical yield of 802? (2 pts) h 5 W» 3,0 g, E; —> (302(8) + 502(8) 44.009 64.064 \ QM \II g: 0 ($3331 1* W $2: >': Livé? % :50 alarmist?) (wittwwm r: fiitttg e) If the percent yield is 75%, what is the actual yield of $02? (2 pts> -2- Name: 2. Name each of the following elements (1 pt each) Elam Link a m 3. Convert the following (2 pts each) 0.555 picoseconds to seconds 64 megabytes to bytes 4. Liquids generally expand in volume when they are warmed. Assuming no loss by evapo— ration would the density of such a 1i uid . increase, éeaeasefw or stay the same upon warming? (circle answer) (2 ptS) WMLHMW Chemistry 1 12 Spring 2008 Quiz 1 Name: You must show all of your work and use significant figures. 1. The following reaction was performed in a sealed vessel MFBSZG) +Hoz<g> 4 2711262036) +g802(g) molar masses: 119.977 31.998 159.687 64.064 a v | 4 a) Balance the equation (2 pts) 0 0‘. ax : 3+ is H 1’57 x; H/ai b) How many moles of 02 are needed to produce 4.50 moles of 802? 2 t ( p s) ] umpz \) I m - j l "'3 g *1“ \fi HIDE) “fig, ewzvrgflb’olw i: c) How many pounds of F6203 are produced along with 8.41 pounds of S02? Wanner-«Munmm, (W (2 _ L. “m, . - . > x» a some» {13a -~W W 14: WM W {131%, ll {iii @1594 i ii wfiifiez €369.14 1:183}??? d) 20.0 g of 02 and 83.4 g of FeS2 are initially put into the reaction vessel. 1) Which reagent is limiting? wag. mi; Ft? 1% (2 pts) 1 \‘flfldérew T?“ "f '1'! m _, WWW «a 44‘ 1 i W 2) What is the total mass in the vessel when the reaction ends? 2 S w ~ 5' w. M r f ( pt) “Wit-325;; is: (Taggififif) w. Wag (in; .. ti @040 k, ., I. 3%:1... h ‘41-)!!! i . V ,L ._,,. Wiwjji“ tug it" “.1. Vt’fi) I) “ \V M NM; £5 1 \Q .614"! {1. ' ii 1 ‘K— We miss ii. is {3 0 u '3} 6:; ‘0 a... l ’ 0. Hist? wwma Name: 2. Fill in the missing entries in the following table of elements (1 pt each) 3. Convert the following (2 pts each) j “NU NV: : 10 4.75 km3 to cm , ' WWW {WWWM gr \ Y K law: I) \ We . ‘ _ M“ 6.5 ,uL to cm3 4. Give the molecular formula for propanol 2propanol + 902 —> 6COZ + SHZO (2 pts) Ci! (9 {:2 L am w 2E J) Chemistry 112 Quiz 1 Spring 2008 Name: You must show all of your work and use significant figures. 1. a) An isotope of Br has a mass of 80.92. Give its mass number. £3 5 (5 W) b) For each of the following atoms or ions give its symbol ,3 61?“, ($37“ :2? M with 36 electrons, 38 protons, and 49 neutrons. with 54 electrons, atomic number 53, and mass number 127 with 48 electrons, mass number 118, and 68 neutrons. 0) Considering Only subatomic particles exactly how do fiNa and fiMg differ? éfirtwwm Em? “m was i Wi‘attz.%i§ nggm trim; % mfiiwwm} 2. A compound of phosphorus and oxygen contains 49.2% P. a) What is its empirical formula? (4 9“) (iris-aim 101'} fi it». a???) I09 Wt. 59 a a}, E? a W H ‘ . i ‘ t... 4Q“ 1;" fit) 5 w "fret" W;§1!I‘X~V“*5‘J ., "‘ .flwwgmmw i‘ i" fi"';§.”ww"? , W Li?) ‘w be m www- ‘WW. “a: a. t 3:3;0 w” ’ 5.- ~ mu}: M.Wm;:.,,m wt,— 3’), i“%°§§ Hwy/£1 lfi‘fifit 52“ «grim b) If 1. 25 x 10‘3 mol has a mass of 0.315 g what is its molecular formula? (1 pt) 5 \J M? it has» to ‘ Q 5:1in “iii a “ g” _2_ Name: 3. Give formulas for each of the following: (1 pt each) permanganate ion iron(III) ion hydrogen carbonate ion ammonium ion cadmium ion sulfate ion mercury(I) ion calcium ion ‘ hydroxide ion chlorate ion Chemistry 112 Quiz 1 Spring 2008 Name: You must show all of your work and use significant figures. 1. A compound known to contain only one platinum atom in its molecular formula was ana- lyzed and found to contain 65.01 mass % platinum . What is the molar mass of the com- pound? 4 ts r ( p ) § \ a? .m‘ .r- a, I e’ r ‘ A, i wwwgghmmmm “(M Wat-Manama.” 52$ 05% {figflfié swam”, w metaygfi AW '3’ W ' "Y a I ,, firms-“x E Q i. é first“ 4 em» if, ' ,1 4v . (7 :1 z‘ {Mia}? was, M: i "~v- 0% 2. What volume of bromine (d=3.12 g mL‘l) has the same mass as 35.00 mL of mercury (d=13.55 g mL“1)? ‘ m kc” IT .1 \‘gzw n E g ,i I K (2 p“) mum mag ‘9 firm“? ia a tit: " ' ” V a V , Oil/Hg V age { gist 3:2 tits atria N: ‘ e x ‘ a"; mtsmfilgngamwcum :7 W. H. WamWww..mwu.«MSW. :_ 3- 3’ rte, Kim ' 3. Balance the following equations: (2 pts each) a) gfiu “t $Na2é<aq> +t2fé“Tf<aq> a tFezsgm + sNaCKaq) 3 m r) {a {a 1205 + BI'F3 —) [F5 + 02 + {k x We: a. :43!sz 10/9, (a 5%in 1:2“? it) _2_ Name: 4. Give the name of the group to which each of the following elements belong: (1 pt each) a) Group VI elements b) Group 11 elements 5. Give formulas for each of the following: (1 pt each) hypochlorite ion lead(IV) ion nitrite ion silver ion hydrogen sulphate ion mercurya) ion peroxide ion chromate ion (it: n Mia? (“litigatirrbéga (fag/raver ’l Chemistry 112 Quiz 1 Spring 2008 Name: You must show all of your work and use significant figures. 1. From the following data and your periodic table determine the percent natural abundance of the following two isotopes to the correct number of significant figures. (4 pts) isotope isotopic mass 14N 14.00307 15N 15.00011 Mflnfiafié- Y 3x» EfiK‘QQWM V3) gtgwfi {gr} [3 fidmfifi Cit: { "1 X ammo w lama: 0036.35“ ‘9“ a”) 2;” m,.M‘o’wmwmrwm«unwramsargwwfiimWV-J “T; I ‘ kwmfiimmmém C) I; 5 1‘5 mum g whoa;sz m mfg 9 30 $1} 2. Chlorobenzaldehyde (C7H50C1) is a solid at room temperature with a density of 1.25 g mL_1. If the mass of one mole is 140 g what is the volume of 1.50 mol? (2 pts) g. (0505;504:332. , _ 3. Balance the following equations: (2 pts each) i t” » A? . “4. a) 2%“! 22$” X‘s} Elisa, 2&1.» HSbC14 + H23 a $13233 + i—ic1 In gm. 0% “51 if a, “3.30 l b) '"' @ Cu3(P 4)2(s) + HCl(aq) —> CuC12(aq) + H3PO4(aq) \ (p -2- Name: 3. Give formulas for each of the following: (1 pt each) copper(II) ion carbonate ion hydronium ion Zinc ion hydrogen phosphate ion mercury(I) ion magnesium ion hydroxide ion dichromate ion ...
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quiz_1_solutions - Chemistry 112 Spring 2008 Quiz 1 Name:...

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